Question

Urgent!!! PLEASE HELP, FAST!!!

Answer 1

The best way to solve this is to put it into a proportion:
$\frac{x}{84} = \frac{ \frac{1}{4} }{ \frac{3}{4} }$
So you cross multiply to get:
$21= \frac{3}{4} x$ (the 21 is from $\frac{1}{4}$•84)
Then multiply by $\frac{4}{3}$
And you get $28, so the reduced price would be $28.